Abstract: According to the descriptive-explanatory-humanistic ideological system,the three main routes of evolution course in hydrological sciences were summarized from the following three dimensions:problems,disciplines,and methodologies.It can be seen from the dialectical analysis amongst different stages along the routes that the intersection of the main routes will generate the new frontier directions in objects of study,scientific recognition,and technical innovation for the field of hydrology.This paper also discussed and remarked the relationship between empirical method and theoretical formula,the compatibility between deterministic and stochastic approaches,in view of hydrosphere complexity around the Earth.Finally the authors emphasized the significance of the research on water cycle routes/processes organization by means of the organization of various sorts of logical thinking modes,because of hydrological variability,system diversity,changing environments,and more uncertainty in the real world.